diff --git a/packages/workflow-executor/src/types/validated/collection.ts b/packages/workflow-executor/src/types/validated/collection.ts
index c6c49414b6..801423d384 100644
--- a/packages/workflow-executor/src/types/validated/collection.ts
+++ b/packages/workflow-executor/src/types/validated/collection.ts
@@ -52,7 +52,10 @@ export const FieldSchemaSchema = z.object({
   // Polymorphic relations: discriminator column + candidate target collections, resolved per record.
   polymorphicTypeField: z.string().optional(),
   polymorphicReferencedModels: z.array(z.string()).optional(),
-  type: ColumnTypeSchema.nullable().optional(),
+  // forest-rails apimaps carry field types this contract can't model — hand-authored smart-field
+  // type strings, and `[null]` from array columns the liana fails to map. They must not fail the
+  // whole collection schema; an unparseable type normalizes to null (consumers already guard on it).
+  type: ColumnTypeSchema.nullable().optional().catch(null),
   enumValues: z.array(z.string()).min(1).optional(),
 });
 export type FieldSchema = z.infer<typeof FieldSchemaSchema>;
diff --git a/packages/workflow-executor/test/types/collection.test.ts b/packages/workflow-executor/test/types/collection.test.ts
new file mode 100644
index 0000000000..b2ca376252
--- /dev/null
+++ b/packages/workflow-executor/test/types/collection.test.ts
@@ -0,0 +1,49 @@
+import { CollectionSchemaSchema, FieldSchemaSchema } from '../../src/types/validated/collection';
+
+describe('FieldSchemaSchema type tolerance', () => {
+  const base = {
+    fieldName: 'col',
+    displayName: 'Col',
+    isRelationship: false,
+  };
+
+  it('parses a primitive type', () => {
+    expect(FieldSchemaSchema.parse({ ...base, type: 'String' }).type).toBe('String');
+  });
+
+  it('normalizes a non-primitive smart-field type string to null', () => {
+    expect(FieldSchemaSchema.parse({ ...base, type: 'DateTime' }).type).toBeNull();
+  });
+
+  it('normalizes a [null] array-column type to null', () => {
+    expect(FieldSchemaSchema.parse({ ...base, type: [null] }).type).toBeNull();
+  });
+
+  it('keeps an explicit null type as null', () => {
+    expect(FieldSchemaSchema.parse({ ...base, type: null }).type).toBeNull();
+  });
+
+  it('keeps a missing type as undefined', () => {
+    expect(FieldSchemaSchema.parse(base).type).toBeUndefined();
+  });
+});
+
+describe('CollectionSchemaSchema field type tolerance', () => {
+  const collection = {
+    collectionName: 'orders',
+    collectionId: 'orders',
+    collectionDisplayName: 'Orders',
+    primaryKeyFields: ['id'],
+    fields: [
+      { fieldName: 'id', displayName: 'Id', isRelationship: false, type: 'Number' },
+      { fieldName: 'computed', displayName: 'Computed', isRelationship: false, type: 'DateTime' },
+      { fieldName: 'tags', displayName: 'Tags', isRelationship: false, type: [null] },
+    ],
+  };
+
+  it('parses the collection instead of rejecting it, dropping unparseable types to null', () => {
+    const parsed = CollectionSchemaSchema.parse(collection);
+
+    expect(parsed.fields.map(f => f.type)).toEqual(['Number', null, null]);
+  });
+});